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【单选题】
(氢原子光谱)(2018·湖南衡阳模拟)下列有关氢原子光谱的说法正确的是( )
A.
氢原子的发射光谱是连续谱
B.
氢原子光谱说明氢原子只发出特定频率的光
C.
氢原子光谱说明氢原子能量是连续的
D.
氢原子光谱线的频率与氢原子能级的能量差无关
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【判断题】Alaska is the largest state on the continuous continent.
A.
正确
B.
错误
【简答题】线圈一端的绝缘皮只刮去半周,则这半周线圈转动的原理是 ________________________ ;另外半周的绝缘皮没有刮掉,则这半周线圈是在 _________ 的作用下实现连续转动的。 简易线圈的这种结构相当于电动机的 __________ 。
【单选题】The Joneses (have visited) Hawaii and Alaska, and they (assure me) that (they) like Alaska (the best).
A.
have visited
B.
assure me
C.
they
D.
the best
【单选题】The Alaska Pipeline The Alaska pipeline starts at the frozen edge of the Arctic Ocean. It stretches southward across the largest and northernmost state in the United States, ending at a remote ice-fre...
A.
operating costs
B.
employees
C.
consumers
D.
construction
【单选题】二进制的子网掩码11111000表示成十进制是
A.
210
B.
224
C.
240
D.
248
【简答题】It is time to start planning your 2010 Alaska Vcation! Take a look at newly expanded Alaska tour. Alaska hotels, and Alaska vacation packages. Our 2010 selection offers the most Alaska travel options ...
【单选题】Alaska 1 In 1959 Americans welcomed Alaska into the Union as the 49th state, symbolizing a change of attitude from that held in 1867, when the peninsula was purchased from Russia. Then, most Americans...
A.
Rich Resources of the State
B.
Connections with the Outside World
C.
Transportation Problem
D.
The Natives of the Land
E.
Cold Climate
F.
Land and Population Paragraph 3 ______
【简答题】A.Because gold was found in Alaska. B.Because Alaska has an abundance of seafood. C.Because Alaska proved rich in oil and minerals. D.Because Alaska is bordered by Yukon.
【判断题】Before America purchased it,Alaska was belong to Mexico.( )
A.
正确
B.
错误
【单选题】二进制的子网掩码11111000表示成十进制是
A.
224
B.
240
C.
248
D.
252
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